[Cl-].[OH:2][NH3+:3].N1C=CC=CC=1.[CH2:10]([O:12][N:13]=[C:14]([CH2:18][C:19]([CH3:21])=[CH2:20])[C:15](=O)[CH3:16])[CH3:11]>O.CO>[CH2:10]([O:12][N:13]=[C:14]([CH2:18][C:19]([CH3:21])=[CH2:20])[C:15](=[N:3][OH:2])[CH3:16])[CH3:11]By the method of Example 4, 211.3 g of hydroxylammonium chloride in 400 ml of water and 240 g of pyridine were reacted with 342.4 g of 5-methylhex-5-ene-2,3-dione 3-(O-ethyloxime) in 800 ml of methanol. This gave 305 g of the title compound as a yellowish solid.
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